@Override
public final void onCharacteristicChanged(
final BluetoothGatt gatt, final BluetoothGattCharacteristic characteristic) {
final String data = ParserUtils.parse(characteristic);
if (isBatteryLevelCharacteristic(characteristic)) {
Logger.i(
mLogSession,
"Notification received from " + characteristic.getUuid() + ", value: " + data);
final int batteryValue =
characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0);
Logger.a(mLogSession, "Battery level received: " + batteryValue + "%");
mCallbacks.onBatteryValueReceived(batteryValue);
} else {
final BluetoothGattDescriptor cccd =
characteristic.getDescriptor(CLIENT_CHARACTERISTIC_CONFIG_DESCRIPTOR_UUID);
final boolean notifications =
cccd == null
|| cccd.getValue() == null
|| cccd.getValue().length != 2
|| cccd.getValue()[0] == 0x01;
if (notifications) {
Logger.i(
mLogSession,
"Notification received from " + characteristic.getUuid() + ", value: " + data);
onCharacteristicNotified(gatt, characteristic);
} else { // indications
Logger.i(
mLogSession,
"Indication received from " + characteristic.getUuid() + ", value: " + data);
onCharacteristicIndicated(gatt, characteristic);
}
}
}
@Override
public void onCharacteristicWrite(
final BluetoothGatt gatt,
final BluetoothGattCharacteristic characteristic,
final int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
Logger.i(
mLogSession,
"Data written to "
+ characteristic.getUuid()
+ ", value: "
+ ParserUtils.parse(characteristic.getValue()));
// The value has been written. Notify the manager and proceed with the initialization queue.
onCharacteristicWrite(gatt, characteristic);
nextRequest();
} else if (status == BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION) {
if (gatt.getDevice().getBondState() != BluetoothDevice.BOND_NONE) {
DebugLogger.w(TAG, ERROR_AUTH_ERROR_WHILE_BONDED);
mCallbacks.onError(ERROR_AUTH_ERROR_WHILE_BONDED, status);
}
} else {
DebugLogger.e(TAG, "onCharacteristicRead error " + status);
onError(ERROR_READ_CHARACTERISTIC, status);
}
}
@Override
public final void onDescriptorWrite(
final BluetoothGatt gatt, final BluetoothGattDescriptor descriptor, final int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
Logger.i(
mLogSession,
"Data written to descr. "
+ descriptor.getUuid()
+ ", value: "
+ ParserUtils.parse(descriptor));
if (isServiceChangedCCCD(descriptor)) {
Logger.a(mLogSession, "Service Changed notifications enabled");
if (!readBatteryLevel()) nextRequest();
} else if (isBatteryLevelCCCD(descriptor)) {
final byte[] value = descriptor.getValue();
if (value != null && value.length > 0 && value[0] == 0x01) {
Logger.a(mLogSession, "Battery Level notifications enabled");
nextRequest();
} else Logger.a(mLogSession, "Battery Level notifications disabled");
} else {
nextRequest();
}
} else if (status == BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION) {
if (gatt.getDevice().getBondState() != BluetoothDevice.BOND_NONE) {
DebugLogger.w(TAG, ERROR_AUTH_ERROR_WHILE_BONDED);
mCallbacks.onError(ERROR_AUTH_ERROR_WHILE_BONDED, status);
}
} else {
DebugLogger.e(TAG, "onDescriptorWrite error " + status);
onError(ERROR_WRITE_DESCRIPTOR, status);
}
}
@Override
public final void onServicesDiscovered(final BluetoothGatt gatt, final int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
Logger.i(mLogSession, "Services Discovered");
if (isRequiredServiceSupported(gatt)) {
Logger.v(mLogSession, "Primary service found");
final boolean optionalServicesFound = isOptionalServiceSupported(gatt);
if (optionalServicesFound) Logger.v(mLogSession, "Secondary service found");
// Notify the parent activity
mCallbacks.onServicesDiscovered(optionalServicesFound);
// Obtain the queue of initialization requests
mInitInProgress = true;
mInitQueue = initGatt(gatt);
// When the device is bonded and has Service Changed characteristic, the indications must
// be enabled first.
// In case this method returns true we have to continue in the onDescriptorWrite callback
if (ensureServiceChangedEnabled(gatt)) return;
// We have discovered services, let's start by reading the battery level value. If the
// characteristic is not readable, try to enable notifications.
// If there is no Battery service, proceed with the initialization queue.
if (!readBatteryLevel()) nextRequest();
} else {
Logger.w(mLogSession, "Device is not supported");
mCallbacks.onDeviceNotSupported();
disconnect();
}
} else {
DebugLogger.e(TAG, "onServicesDiscovered error " + status);
onError(ERROR_DISCOVERY_SERVICE, status);
}
}
/**
* When the device is bonded and has the Generic Attribute service and the Service Changed
* characteristic this method enables indications on this characteristic. In case one of the
* requirements is not fulfilled this method returns <code>false</code>.
*
* @param gatt the gatt device with services discovered
* @return <code>true</code> when the request has been sent, <code>false</code> when the device is
* not bonded, does not have the Generic Attribute service, the GA service does not have the
* Service Changed characteristic or this characteristic does not have the CCCD.
*/
private boolean ensureServiceChangedEnabled(final BluetoothGatt gatt) {
if (gatt == null) return false;
// The Service Changed indications have sense only on bonded devices
final BluetoothDevice device = gatt.getDevice();
if (device.getBondState() != BluetoothDevice.BOND_BONDED) return false;
final BluetoothGattService gaService = gatt.getService(GENERIC_ATTRIBUTE_SERVICE);
if (gaService == null) return false;
final BluetoothGattCharacteristic scCharacteristic =
gaService.getCharacteristic(SERVICE_CHANGED_CHARACTERISTIC);
if (scCharacteristic == null) return false;
Logger.i(mLogSession, "Service Changed characteristic found on a bonded device");
return enableIndications(scCharacteristic);
}
@Override
public void onReceive(final Context context, final Intent intent) {
final BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
final int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
final int previousBondState =
intent.getIntExtra(BluetoothDevice.EXTRA_PREVIOUS_BOND_STATE, -1);
// Skip other devices
if (mBluetoothGatt == null
|| !device.getAddress().equals(mBluetoothGatt.getDevice().getAddress())) return;
Logger.d(
mLogSession,
"[Broadcast] Action received: "
+ BluetoothDevice.ACTION_BOND_STATE_CHANGED
+ ", bond state changed to: "
+ bondStateToString(bondState)
+ " ("
+ bondState
+ ")");
DebugLogger.i(
TAG,
"Bond state changed for: "
+ device.getName()
+ " new state: "
+ bondState
+ " previous: "
+ previousBondState);
switch (bondState) {
case BluetoothDevice.BOND_BONDING:
mCallbacks.onBondingRequired();
break;
case BluetoothDevice.BOND_BONDED:
Logger.i(mLogSession, "Device bonded");
mCallbacks.onBonded();
// Start initializing again.
// In fact, bonding forces additional, internal service discovery (at least on Nexus
// devices), so this method may safely be used to start this process again.
Logger.v(mLogSession, "Discovering Services...");
Logger.d(mLogSession, "gatt.discoverServices()");
mBluetoothGatt.discoverServices();
break;
}
}
@Override
public final void onCharacteristicRead(
final BluetoothGatt gatt,
final BluetoothGattCharacteristic characteristic,
final int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
Logger.i(
mLogSession,
"Read Response received from "
+ characteristic.getUuid()
+ ", value: "
+ ParserUtils.parse(characteristic));
if (isBatteryLevelCharacteristic(characteristic)) {
final int batteryValue =
characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0);
Logger.a(mLogSession, "Battery level received: " + batteryValue + "%");
mCallbacks.onBatteryValueReceived(batteryValue);
// The Battery Level value has been read. Let's try to enable Battery Level notifications.
// If the Battery Level characteristic does not have the NOTIFY property, proceed with the
// initialization queue.
if (!setBatteryNotifications(true)) nextRequest();
} else {
// The value has been read. Notify the manager and proceed with the initialization queue.
onCharacteristicRead(gatt, characteristic);
nextRequest();
}
} else if (status == BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION) {
if (gatt.getDevice().getBondState() != BluetoothDevice.BOND_NONE) {
DebugLogger.w(TAG, ERROR_AUTH_ERROR_WHILE_BONDED);
mCallbacks.onError(ERROR_AUTH_ERROR_WHILE_BONDED, status);
}
} else {
DebugLogger.e(TAG, "onCharacteristicRead error " + status);
onError(ERROR_READ_CHARACTERISTIC, status);
}
}
@Override
public final void onConnectionStateChange(
final BluetoothGatt gatt, final int status, final int newState) {
Logger.d(
mLogSession,
"[Callback] Connection state changed with status: "
+ status
+ " and new state: "
+ newState
+ " ("
+ stateToString(newState)
+ ")");
if (status == BluetoothGatt.GATT_SUCCESS && newState == BluetoothProfile.STATE_CONNECTED) {
// Notify the parent activity/service
Logger.i(mLogSession, "Connected to " + gatt.getDevice().getAddress());
mConnected = true;
mCallbacks.onDeviceConnected();
/*
* The onConnectionStateChange event is triggered just after the Android connects to a device.
* In case of bonded devices, the encryption is reestablished AFTER this callback is called.
* Moreover, when the device has Service Changed indication enabled, and the list of services has changed (e.g. using the DFU),
* the indication is received few milliseconds later, depending on the connection interval.
* When received, Android will start performing a service discovery operation itself, internally.
*
* If the mBluetoothGatt.discoverServices() method would be invoked here, if would returned cached services,
* as the SC indication wouldn't be received yet.
* Therefore we have to postpone the service discovery operation until we are (almost, as there is no such callback) sure, that it had to be handled.
* Our tests has shown that 600 ms is enough. It is important to call it AFTER receiving the SC indication, but not necessarily
* after Android finishes the internal service discovery.
*
* NOTE: This applies only for bonded devices with Service Changed characteristic, but to be sure we will postpone
* service discovery for all devices.
*/
mHandler.postDelayed(
new Runnable() {
@Override
public void run() {
// Some proximity tags (e.g. nRF PROXIMITY) initialize bonding automatically when
// connected.
if (gatt.getDevice().getBondState() != BluetoothDevice.BOND_BONDING) {
Logger.v(mLogSession, "Discovering Services...");
Logger.d(mLogSession, "gatt.discoverServices()");
gatt.discoverServices();
}
}
},
600);
} else {
if (newState == BluetoothProfile.STATE_DISCONNECTED) {
if (status != BluetoothGatt.GATT_SUCCESS)
Logger.w(
mLogSession,
"Error: (0x"
+ Integer.toHexString(status)
+ "): "
+ GattError.parseConnectionError(status));
onDeviceDisconnected();
mConnected = false;
if (mUserDisconnected) {
Logger.i(mLogSession, "Disconnected");
mCallbacks.onDeviceDisconnected();
close();
} else {
Logger.w(mLogSession, "Connection lost");
mCallbacks.onLinklossOccur();
// We are not closing the connection here as the device should try to reconnect
// automatically.
// This may be only called when the shouldAutoConnect() method returned true.
}
return;
}
// TODO Should the disconnect method be called or the connection is still valid? Does this
// ever happen?
Logger.e(
mLogSession,
"Error (0x"
+ Integer.toHexString(status)
+ "): "
+ GattError.parseConnectionError(status));
mCallbacks.onError(ERROR_CONNECTION_STATE_CHANGE, status);
}
}
